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a bacterium that occurs mainly in the gut, especially a serotype causing food poisoning.

Escherichia coli (E. coli) bacteria normally live in the intestines of healthy people and animals. Most types of E. coli are harmless or cause relatively brief diarrhea. But a few strains, such as E. coliO157:H7, can cause severe stomach cramps, bloody diarrhea and vomiting. You may be exposed to E. coli from contaminated water or food — especially raw vegetables and undercooked ground beef. Healthy adults

symptoms

Only a few strains of E. coli trigger diarrhea. The E. coli O157:H7 strain belongs to a group of E. coli that produces a powerful toxin that damages the lining of the small intestine. This can cause bloody diarrhea. You develop an E. coliinfection when you ingest this strain of bacteria. Unlike many other disease-causing bacteria, E. coli can cause an infection even if you ingest only small amounts. Because of this, you can be 

Campylobacteriosis is an infection by the Campylobacter bacterium, most commonly C. jejuni. It is among the most common bacterial infections of humans, often a foodborne illness. It produces an inflammatory, sometimes bloody, diarrhea or dysentery syndrome, mostly including cramps,

What is food poisoning? 

Signs and symptoms

Look for: Food poisoning can be caused by eating contaminated food. In most cases the food hasn’t been cooked properly and is contaminated by bacteria, such as salmonella or E. coli.